Hydraulic control apparatus and systems

Claim 1

IN A HYDRAULIC ELEVATOR SYSTEM INCLUDING A CAR; A JACK HAVING A FLUID INLET; A FLUID RESERVOIR HAVING A FLUID OUTLET AND A FLUID INLET; A FLUID PUMP HAVING A FLUID OUTLET AND A FLUID INLET; A CHECK VALVE HAVING A FLUID OUTLET AND A FLUID INLET; A HYDRAULIC CONTROL VALVE COMPRISING: A VALVE BODY HAVING INLET AND OUTLET APERTURES, AND A MAIN PASSAGE COMMUNICATING BETWEEN SAID APERTURES; A VALVE CLOSURE INCLUDING A MOVABLE ELEMENT INTERPOSED IN SAID MAIN PASSAGE; A CYLINDER, AND A PISTON RECIPROCABLE IN SAID CYLINDER; A FIRST FLUID CAVITY FORMED BY SAID PISTON AND CYLINDER ON ONE SIDE OF SAID PISTON, AND A SECOND FLUID CAVITY FORMED BY SAID PISTON AND CYLINDER ON THE OTHER SIDE OF SAID PISTON; MEANS LINKING SAID MOVABLE ELEMENT TO SAID PISTON FOR MOVEMENT THEREWITH; FIRST FLUID PASSAGE MEANS COMMUNICATING BETWEEN SAID INLET APERTURE AND SAID FIRST CAVITY; SECOND FLUID PASSAGE MEANS COMMUNICATING BETWEEN SAID SECOND CAVITY AND THE EXTERIOR OF SAID CYLINDER; AN APERTURE IN SAID PISTON AND EXTENDING IN THE DIRECTION OF PISTON MOVEMENT; A PIN SLIDABLY RECEIVED BY SAID PISTON APERTURE; A THIRD CAVITY WITHIN SAID PIN AND EXTENDING LONGITUDINALLY THEREOF, AND AN ORIFICE COMMUNICATING BETWEEN SAID THIRD CAVITY AND THE PIN EXTERIOR, SAID ORIFICE BEING POSITIONED SUCH THAT IT IS EXPOSED TO SAID SECOND CAVITY WHEN SAID VALVE IS CLOSED AND BLOCKED BY SAID PISTON WHEN SAID VALVE IS PARTIALLY OPENED; THIRD FLUID PASSAGE MEANS COMMUNICATING BETWEEN SAID THIRD CAVITY AND SAID OUTLET APERTURE; RESILIENT BIAS MEANS OPPOSING MOVEMENT OF SAID PIN IN THE AXIAL DIRECTION TOWARD SAID FIRST CAVITY FROM SAID SECOND CAVITY; AND MEANS ALLOWING PRESSURE OF FLUID IN SAID SECOND CAVITY TO ACT ON SAID PIN IN A DIRECTION TO OPPOSE THE FORCE OF SAID BIAS MEANS; FLUID CONDUIT MEANS CONNECTING SAID RESERVOIR OUTLET TO SAID PUMP INLET; FLUID CONDUIT MEANS CONNECTING SAID PUMP OUTLET TO SAID CHECK VALVE INLET; FLUID CONDUIT MEANS CONNECTING SAID CHECK VALVE OUTLET TO SAID JACK INLET; CONDUIT MEANS CONNECTING SAID PUMP OUTLET TO SAID CONTROL VALVE INLET APERTURE; CONDUIT MEANS CONNECTING SAID CONTROL VALVE OUTLET APERTURE TO SAID RESERVOIR INLET; A FIRST NORMALLY CLOSED SOLENOID VALVE HAVING AN INLET AND AN OUTLET; CONDUIT MEANS CONNECTING SAID PUMP OUTLET TO SAID SOLENOID VALVE INLET; CONDUIT MEANS CONNECTING SAID SOLENOID VALVE OUTLET TO SAID CONTROL VALVE SECOND FLUID PASSAGE MEANS; A SECOND NORMALLY OPEN SOLENOID VALVE HAVING AN INLET AND AN OUTLET; CONDUIT MEANS CONNECTING THE OUTLET OF SAID NORMALLY OPEN SOLENOID VALVE TO SAID RESERVOIR INLET; CONDUIT MEANS CONNECTING SAID CONTROL VALVE SECOND FLUID PASSAGE MEANS TO THE INLET OF SAID NORMALLY OPEN SOLENOID VALVE; MEANS FOR OPENING SAID FIRST SOLENOID VALVE AND CLOSING SAID SECOND SOLENOID VALVE PREPARATORY TO MOVEMENT OF SAID CAR IN THE UPWARD DIRECTION; MEANS FOR CLOSING SAID FIRST SOLENOID VALVE AS SAID CAR NEARS A FLOOR TERMINAL; AND MEANS FOR CLOSING SAID SECOND SOLENOID VALVE WHEN SAID CAR ARRIVES AT SAID FLOOR TERMINAL.